Jefferson was also about 6’2” and I have read that his father was very large and powerful.
Read a comtemporary British Revolution era writer commenting on the over-mountain men in the southern colonies and how many were six footers. I reckon they ate a high protein/meat diet.
hunters over grazers
In the very good book "Undaunted Courage" by Stephen Ambrose, about the Lewis and Clark Expedition, it was recorded by Lewis that the men ate about seven or eight pounds of meat per day (if it was available). They did perform very hard labor, poling the boats. I cannot see how a person could possibly eat that much.